It's been 24 hours since I did the water change and dosed the tank to 4 ppm of ammonia. Here are the readings today:
Ammonia: 2 ppm
Nitrite: 0 ppm
Nitrate: 20 ppm
PH: 7.2 ppm
I added ammonia to bring it back up to 4 ppm.
The objective now is to get the ammonia to drop to 0 in 24...
I did a 50% water change today; I know you said 80 to 90%, but I decided to be a bit conservative!
Here are the readings before the water change:
Ammonia: 2 ppm (it's been at 2 since June 4th)
Nitrite: 0 ppm
Nitrate: 40 ppm
Here are the readings after the water...
Interesting, I thought after the nitrite spike the ammonia was supposed to be reduced to 2 ppm. I did have the ammonia at 4 ppm during the cycle and only reduced it after the nitrites went to 0.
I'll try a water change and dose the ammonia up to 4 and we'll see what happens. Maybe some day...
I am using the API liquid test kit. I did do an ammonia test on my tap water yesterday to make sure my test kit was working and it is; my tap water read 0 ppm ammonia.
My tank has been cycling fishless for 8 weeks. Everything has gone as expected, the nitrites spiked and then dropped to 0 and the nitrates are at 40 ppm. The ammonia, however, will not drop below 1 ppm. I left it for 6 days and it still read 1 ppm; I added ammonia to bring it to 2 ppm and after...